/*
 * Copyright 2012-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.boot.web.support;

import javax.servlet.ServletContext;

import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextInitializer;
import org.springframework.core.Ordered;
import org.springframework.web.context.ConfigurableWebApplicationContext;
import org.springframework.web.context.WebApplicationContext;

/**
 * {@link ApplicationContextInitializer} for setting the servlet context.
 *
 * @author Dave Syer
 * @author Phillip Webb
 * @since 1.4.0
 */
public class ServletContextApplicationContextInitializer implements
        ApplicationContextInitializer<ConfigurableWebApplicationContext>, Ordered
{

    private int order = Ordered.HIGHEST_PRECEDENCE;

    private final ServletContext servletContext;

    private final boolean addApplicationContextAttribute;

    /**
     * Create a new {@link ServletContextApplicationContextInitializer} instance.
     *
     * @param servletContext the servlet that should be ultimately set.
     */
    public ServletContextApplicationContextInitializer(ServletContext servletContext)
    {
        this(servletContext, false);
    }

    /**
     * Create a new {@link ServletContextApplicationContextInitializer} instance.
     *
     * @param servletContext                 the servlet that should be ultimately set.
     * @param addApplicationContextAttribute if the {@link ApplicationContext} should be
     *                                       stored as an attribute in the {@link ServletContext}
     * @since 1.3.4
     */
    public ServletContextApplicationContextInitializer(ServletContext servletContext,
                                                       boolean addApplicationContextAttribute)
    {
        this.servletContext = servletContext;
        this.addApplicationContextAttribute = addApplicationContextAttribute;
    }

    public void setOrder(int order)
    {
        this.order = order;
    }

    @Override
    public int getOrder()
    {
        return this.order;
    }

    @Override
    public void initialize(ConfigurableWebApplicationContext applicationContext)
    {
        applicationContext.setServletContext(this.servletContext);
        if (this.addApplicationContextAttribute)
        {
            this.servletContext
                    .setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, applicationContext);
        }

    }

}
